Motor vehicles – Having four wheels driven – With differential means for driving two wheel sets at...
Patent
1991-05-08
1993-05-11
Focarino, Margaret A.
Motor vehicles
Having four wheels driven
With differential means for driving two wheel sets at...
74467, 475160, B60K 17348
Patent
active
052093212
ABSTRACT:
The power transmission apparatus comprises a center differential gear, a first inner front wheel drive hub connected to the center differential gear, a second outer rear wheel drive hub also connected to the center differential gear coaxially with the first hub, a ring gear fixed to the second hub, a pinion gear coupled to a propeller shaft and in mesh with the ring gear at a gearing position above the axis of the ring gear, and in particular a lubrication structure including a rotary cover member fixed to the second hub and formed with plural oil stirring projections, an oil sump formed in an inner surface of an apparatus housing, and an oil passage formed in a pinion gear housing. Since the pinion gear is offset upward away from the axial height of the ring gear and further sufficiently lubricated by the lubrication structure, it is possible to dispose a steering rack under the pinion gear housing to improve the steering stability, by always keeping the front wheel alignment at toe-in state under any travelling conditions of a 4WD vehicle.
REFERENCES:
patent: 2015108 (1935-09-01), Harper
patent: 4508190 (1985-04-01), Uchiyama
patent: 4651847 (1987-03-01), Hermanns
patent: 4726254 (1988-02-01), Kubo et al.
patent: 4738152 (1988-04-01), Takimura et al.
patent: 5041068 (1991-08-01), Kobayashi
patent: 5064017 (1991-11-01), Kikuchi
patent: 5143168 (1992-09-01), Sagara
Boehler A. M.
Focarino Margaret A.
Nissan Motor Co,. Ltd.
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